/*
 * This file is part of BlueMap, licensed under the MIT License (MIT).
 *
 * Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package de.bluecolored.bluemap.core.resourcepack.fileaccess;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

public class ZipFileAccess implements FileAccess {

	private ZipFile file;
	
	public ZipFileAccess(File file) throws ZipException, IOException {
		this.file = new ZipFile(file);
	}

	@Override
	public InputStream readFile(String path) throws FileNotFoundException, IOException {
		ZipEntry entry = file.getEntry(path);
		if (entry == null) throw new FileNotFoundException("File " + path + " does not exist in this zip-file!");
		
		return file.getInputStream(entry);
	}

	@Override
	public Collection<String> listFiles(String path, boolean recursive) {
		path = normalizeFolderPath(path);
		
		Collection<String> files = new ArrayList<String>();
		for (Enumeration<? extends ZipEntry> entries = file.entries(); entries.hasMoreElements();) {
			ZipEntry entry = entries.nextElement();
			
			if (entry.isDirectory()) continue;
			
			String file = entry.getName();
			int nameSplit = file.lastIndexOf('/');
			String filePath = "";
			if (nameSplit != -1) {
				filePath = file.substring(0, nameSplit);
			}
			filePath = normalizeFolderPath(filePath);
			
			if (recursive) {
				if (!filePath.startsWith(path) && !path.equals(filePath)) continue;
			} else {
				if (!path.equals(filePath)) continue;
			}
			
			files.add(file);
		}
		
		return files;
	}

	@Override
	public Collection<String> listFolders(String path) {
		path = normalizeFolderPath(path);
		
		Collection<String> folders = new HashSet<String>();
		for (Enumeration<? extends ZipEntry> entries = file.entries(); entries.hasMoreElements();) {
			ZipEntry entry = entries.nextElement();
			
			String file = entry.getName();
			if (!entry.isDirectory()) {
				int nameSplit = file.lastIndexOf('/');
				if (nameSplit == -1) continue;
				file = file.substring(0, nameSplit);
			}
			file = normalizeFolderPath(file);
			
			//strip last /
			file = file.substring(0, file.length() - 1);
			
			int nameSplit = file.lastIndexOf('/');
			String filePath = "/";
			if (nameSplit != -1) {
				filePath = file.substring(0, nameSplit);
			}
			filePath = normalizeFolderPath(filePath);
			
			if (!filePath.startsWith(path)) continue;
			
			int subFolderMark = file.indexOf('/', path.length());
			if (subFolderMark != -1) {
				file = file.substring(0, subFolderMark);
			}
			
			file = normalizeFolderPath(file);
			
			//strip last /
			file = file.substring(0, file.length() - 1);
			
			folders.add(file);
		}
		
		return folders;
	}
	
	private String normalizeFolderPath(String path) {
		if (path.isEmpty()) return path;
		if (path.charAt(path.length() - 1) != '/') path = path + "/";
		if (path.charAt(0) == '/') path = path.substring(1);
		return path;
	}

	@Override
	public void close() throws IOException {
		file.close();
	}
	
}
